Cold Start Control
Table of contents
- Possible Causes
- How To Fix
- Tech Notes
- Cost To Diagnose
- When is the code detected
- Possible Symptoms
- Description
P1421 NISSAN Possible Causes
- Lack of intake air volume (block air filter)
- Fuel injection system (Clogged fuel injector or bad fuel pump)
- Faulty Engine Control Module (ECM)
- Reprogram ECM
How do I fix code P1421 NISSAN?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Tech Notes
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Cost of diagnosing the P1421 NISSAN code
The cost of diagnosing the P1421 NISSAN code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
When is the code detected
The P1421 code is detected when The Engine Control Module (ECM) does not control ignition timing and engine idle speed properly when engine is started with pre-warming up condition.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1421 NISSAN Description
The Engine Control Module (ECM) controls ignition timing and engine idle speed when the engine is started with pre-warming up condition. This control promotes the activation of three-way catalyst by heating the catalyst and reduces emissions.